Dependence of adhesion properties of epoxidized natural rubber (ENR-50)/acrylonitrile-butadiene rubber (NBR) adhesive on rubber blend ratio and testing rate was systematically studied. Coumarone-indene resin and toluene were used as tackifier and solvent, respectively. The rubber blend ratio was fixed at 0%, 20%, 40%, 60%, 80%, and 100% of ENR-50 content. A hand coater was used to coat the adhesive onto a polyethylene terephthalate (PET) at 30, 60, 90, and 120 mu m coating thicknesses. Loop tack, peel strength, and shear strength were determined by a Llyod Adhesion Tester operating at 10-60cm/min. Results indicate that loop tack and peel strength passes through a maximum value at 40% ENR-50, an observation which is attributed to the optimum wettability and compatibility of adhesive at this optimum ENR-50 content. However, for the shear strength, it increases steadily with % ENR-50 due to the constant increase in cohesive strength. For a fixed blend ratio, adhesion property increases with coating thickness and rate of testing.